package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.SetmealDTO;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否已经存在了(通过查询语句
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在，将该商品数量修改+1
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);//取出来唯一的一条数据
            cart.setNumber(cart.getNumber() + 1);//
            shoppingCartMapper.updateNumberById(cart);

        }else {
            //如果不存在，需要插入到购物车表中
            //先判断本次添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //如果是菜品就获取封装菜品的值插入
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());


            }else {
                //如果是套餐就获取封装套餐的值插入
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }


        //




    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //没有传参 根据从BaseContext中取得的id 来查询
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    public void cleanShoppingCart(){
        //获取到当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }


    /**
     * 购物车商品-1操作
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //new一个shoppingCart对象来拷贝 shoppingCartDTO的数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);//查询当前登录用户的购物车数据

        if(list != null && list.size() > 0){

            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }



    }
}
